Mopar 5010884AA black ATF RTV works. It stands up to synthetic so I'd suggest any gasket with a skim coat of the rtv on both surfaces. Works for me. Let is set up a bit and put it together. If you can, let it cure fully. I know the flat rate techs at work put it together and fill it up.
fyi the 5010884AA has been updated to 5010884AD but retains the MS-GF-41-B designation (which you can use at the parts counter or to search ebay/amazon for a deal).
the stuff works good, but you need to apply it exactly according to the package; and this is critical: it only has a shelf life of one year, so check the expiration date otherwise the stuff won't cure!